fix(VAutocomplete): removeEventListener when destroyed

[Y--]

Description

Call document.removeEventListener when component is destroyed

Motivation and Context

VAutocomplete component leaks when the copy listener is attached to document but never released

How Has This Been Tested?

Manually. Please let me know how this is usually automatically tested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and backwards compatible changes and next for non-backwards compatible changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

[TravisBuddy]

Hey @Y--,
Your changes look good to me!

View build log

TravisBuddy Request Identifier: 467e5e40-c068-11ea-8f0c-c508e01afe59

[johnleider]

Can you provide a playground that reproduces the bug and/or reference an issue?

[Y--]

I'm not sure if that's enough for you but here is an example:
https://codepen.io/y-the-encoder/pen/qBbogmR?editors=1010

Then just type something, and toggle the button to remove the autocomplete from the DOM: the element is removed but document.removeEventListener is never called.

Let me know if you need more for this. Thanks!